This type of motor by the Shanghai Institute of Electrical Sciences Organization of the motor industry successfully developed, capacity 1.5~90kW, there are 2,4,6, such as 3 kinds of poles. The full range of motor efficiency averages 3%% higher than Y (IP44) series, near the international advanced level. Suitable for single-direction operation, the annual working time is above 3000h. The load rate is more than 50% occasions, the power saving effect is remarkable. The series of motor output is not high, annual output of about 10,000 kw.